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 A048442 Take the first n numbers written in base 11, concatenate them, then convert from base 11 to base 10. 17
 1, 13, 146, 1610, 17715, 194871, 2143588, 23579476, 259374245, 2853116705, 345227121316, 41772481679248, 5054470283189021, 611590904265871555, 74002499416170458170, 8954302429356625438586, 1083470593952151678068923, 131099941868210353046339701 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..200 EXAMPLE a(11) = (1)(2)(3)(4)(5)(6)(7)(8)(9)(A)(10) = 123456789A10_11 = 345227121316. MATHEMATICA If[STARTPOINT==1, n={}, n=Flatten[IntegerDigits[Range[STARTPOINT-1], 11]]]; Table[AppendTo[n, IntegerDigits[w, 11]]; n=Flatten[n]; FromDigits[n, 11], {w, STARTPOINT, ENDPOINT}] (* Dylan Hamilton, Aug 11 2010 *) f[n_]:= FromDigits[Flatten@IntegerDigits[Range@n, 11], 11]; Array[f, 20] (* Vincenzo Librandi, Dec 30 2012 *) PROG (PARI) { cuo=0; for(ixp=1, 18, casi = ixp; cvst=0; while(casi != 0, cvd = casi%11; cvst=100*cvst + cvd + 1; casi = (casi - cvd) / 11 ); while(cvst !=0, ptch = cvst%100; cuo=cuo*11+ptch-1; cvst = (cvst - ptch) / 100 ); print1(cuo, ", "))} \\ Douglas Latimer, May 09 2012 (Magma) [n eq 1 select 1 else Self(n-1) * 11^(1+Ilog(11, n)) + n: n in [1..20]]; // Vincenzo Librandi, Dec 30 2012 CROSSREFS Cf. A014881. Concatenation of first n numbers in other bases: 2: A047778, 3: A048435, 4: A048436, 5: A048437, 6: A048438, 7: A048439, 8: A048440, 9: A048441, 10: A007908, 11: this sequence, 12: A048443, 13: A048444, 14: A048445, 15: A048446, 16: A048447. Sequence in context: A199023 A152585 A014881 * A353107 A051524 A110748 Adjacent sequences: A048439 A048440 A048441 * A048443 A048444 A048445 KEYWORD nonn,base,easy AUTHOR Patrick De Geest, May 15 1999 EXTENSIONS 1 more term from Douglas Latimer, May 10 2012 STATUS approved

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Last modified February 21 03:52 EST 2024. Contains 370219 sequences. (Running on oeis4.)